There weren't many issues in their flag battle. Rean and Milina were indeed stronger than their opponents. Regio also joined in on the attack as there were three people defending the flag. Samanta stayed on the sides, providing support to those three. Then again, she was basically supporting Regio as Rean and Milina had little to no trouble dispatching their enemies.
Nevertheless, part of the reason why they lost was that their opponents hadn't fully recovered from the last match. Rean's group noticed that their reserves of Divine Energy weren't full, so that helped with their demise. Not too long after, all three of those guys had their protective devices activate, officially being out.
Of course, this was a demon beast forest, so the demon beasts nearby heard the commotion and came out to attack. In any case, it was well within what they could manage.